Four teenage girls, Duro-Aina Adebola (14 years old), Akindele Abiola (14 years old), Faleke Oluwatoyin (14 years old), and Bello Eniola (15 years old), have created a device that turns your pee into electricity.They presented their "Urine Powered Generator" at the Maker Faire Africa in Lagos this year.Their machine can transform 1 liter of human urine into 6 hours of electricity.